The interaction between hexavalent chromium Cr(VI), as K2CrO4, and standard humic acids (HAs) in bulk solution was studied. The observed UV-Vis and X-ray absorption spectra showed that, under our experimental conditions, HAs did not induce reduction of Cr(VI) to its trivalent chemical form. The interaction between Cr(VI) and HAs has rather led to the formation of Cr(VI)–HAs micelles via supramolecular chemical processes. The reported results could contribute towards explaining the relative persistence of ecotoxic hexavalent chromium in soils.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 1068539Our successfull start in EU network of ion beam accelerators SPIRIT. JSI with MIC, where the programme members run ion beam accelerator Tandetron has become one of 7 Laboratories accross EU (with SUR (UK), CEA (France), CENBG (France), KUL (Belgium), FZD (Germany), UBW (Germany)) which offer a transnational access with our two specialities: high resolution x-ray spectroscopy and confocal PIXE (look at the reference). Other members of the network are UPMC (France), ETHZ (Switzerland), RBI (Croatia) and ITN Lisbon (Portugal). More info on www.spirit-ion.eu
D.08 Management and development of research activities
COBISS.SI-ID: 23149607At EET at the Port of Koper a dust arises through activities such as loading, unloading, storage and transport of the six million tonnes of coal each year. To estimate reliably the quantity and composition of dust emitted by stored material upon different wind conditions, a characterisation of the basic dusting processes is required. We measured quantity of the material lost and concentration of dust emitted by prepared surface at different local wind velocities as a function of material type, granule size and moisture.
F.01 Acquisition of new practical knowledge, information and skills
COBISS.SI-ID: 22864935An X-ray spectroscopy and theoretical study of the chemical state of several sulfur bearing minerals was performed. X-ray absorption and high-resolution K? X-ray emission spectra were recorded and compared to ab initio quantum chemical calculations. An analysis of the theoretical sulfur orbital population and valence bond is in agreement with the fluorescence energy position of the K? lines. It is shown that the K? energy shifts can be used for a quantitative determination of the proportion of different sulfur species in heterogeneous samples.
F.01 Acquisition of new practical knowledge, information and skills
COBISS.SI-ID: 22809639By employing statistical methods it was established that from all of the measured elements only the four characteristic key elements Cl, K, Mn, and Rb could be used to best discriminate the types of honey. It was established that the employed combination of a simple, fast, and inexpensive multielement TXRF analytical approach and the evaluation of data by chemometric methods has the potential to discriminate the botanical origins of various types of honey.
F.01 Acquisition of new practical knowledge, information and skills
COBISS.SI-ID: 22578215